I have Enigmail installed trough apt in use on a couple of machines. Bug seems to be fixed in Dapper.
** Changed in: enigmail (Ubuntu) Status: Unconfirmed => Fix Released -- Enigmail breaks Firefox browser https://launchpad.net/bugs/34574 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs